Methanogenic population

Lu Y, T Lueders, MW Friedrich, R Conrad (2005) Detecting active methanogenic populations on rice roots using stable isotope probing. Environ Microbiol 1 326-336. 

Healy JB Jr, Young LY. 1978. Catechol and phenol degradation by a methanogenic population of bacteria. Food Microbiol Toxicol 35 216-218. 

Methanogenesis. The methanogenic population (X2) uses as substrate the volatile fatty acids S2) to produce CO2 and CH4... 

Padmasiri, S., Zhang, J., Fitch, M., Norddahl, B., Morgenroth, E., Raskin, L. (2007). Methanogenic population dynamics and performance of an anaerobic membrane bioreactor (AnMBR) treating swine manure under high shear conditions. Water Research, 41, 134-144. 

Zhang DD, et al. Bioreactor performance and methanogenic population d3mamics in a low-temperature (5-18 degrees C) anaerobic fixed-bed reactor. Bioresour Technol 2012 104 136 3. 

Hackstein et al ° have suggested that there may be a phylogenetic basis for the occurrence of significant methane formation in the gut of animals. It was argued that this refiected the presence of a methanogen receptor in the gut of animals which support large populations of these bacteria, since the production of... 

In combination with Eh, pH strongly influences the types of bacteria that will be present. High- to medium-pH, low-Eh environments will generally restrict bacterial populations to sulfate reducers and heterotrophic anaerobes.187 In reducing conditions, pH strongly affects whether methanogenic or sulfate-reducing bacteria predominate.43... 

During start-up, the microbial population distribution in the biofilm varies with time. Initial colonization of the particle may be by one or more species that alter the surface favorably for colonization by other species. For instance, in the operation of a butyrate-degrading fluidized bed bioreactor, methanogens attached to the sand particles early in the start-up process and produced a primary matrix of heteropolysaccharides that allowed attachment of other bacterial species (Sreekrishnan et al., 1991 Zellner et al., 1991 Yongming et al., 1993). This is contrary to findings in an acetate-propionate-butyrate degrading reactor, in which facultative anaerobes were found to be the initial colonizers (Lauwers et al., 1990). 

Araki, N., and Harada, H., Population Dynamics of Methanogenic Biofilm Consortium during a Start-Up Period of Anaerobic Fluidized Bed Reactor, Wat. Sci. Tech., 29(10-11) 361 (1994)... 

The energetics depicted in this way are in accord with the microbial ecology observed at deep sea hydrothermal systems (e.g., Kelley el al., 2002 Huber el al., 2003 Schrenk et al, 2003). Sediments and black smoker walls invaded by hydrothermal fluids there contain sparse microbial populations of mostly thermophilic methanogens and sulfate reducers. Abundant populations of mesophilic aerobes dominated by sulfide reducers, in contrast, are found in the open ocean where hydrothermal fluids mix freely with seawater. 

The two functional groups of microbes in the aquifer, the sulfate reducing bacteria and methanogens, are present initially in small amounts, just 10-6 mg kg-1, but their populations can grow as they derive energy by metabolizing the acetate. 

Fig. 25. An example of an anaerobic food chain showing the formation of simple compounds from benzoate ion by a population of anaerobic bacteria and the subsequent utilization of the newly available substrate by a second anaerobic population (the methanogenic bacteria)...

---